67.

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75.

Four 1 litre flasks are separately filled with the gases O,,F,,CH, and ९0, , under the same
conditions of temperature and pressure. The ratio of their number of moles will be :

(A) 64 ൯ 1:2:4:3
(0) 1:1:1:1 (D) 2:9:4:8

Most probable velocity, average velocity and RMS velocity are related as :
(A) 1 : 1.28 : 1.224 (8) 1 : 1.28 : 1,424
(© 1: 1.128 : 1.224 (0) 1: 1.428 : 1.441

The rate of diffusion of SO,,CO,,PCl, and SO, are in the following order :
(^) PCl, > ‏و80‎ >SO, > CO, (B) SO, > SO, > PCl, > CO,
(0) CO, > 50, > PCl, > SO, ൬) CO, > ‏و50‎ >SO, > 20,

The ratio of the total volume of bec to simple cubic structure is :
ധ 8 : 348 ൪൫ 348 :8
(0 2443 :1 (D) 1: १५५8

A gas at temperature 250 K and pressure 15 atm, has a molar volume 12% smaller than that
calculated from ideal gas equation, then compressibility factor under these condition is :

(A) 12 (B) 88
(C) 0.12 (D) 0.88

Calculate the freezing point of an aqueous solution of urea, it is boils at 373.1 K
‏بک‎ = 1.8 K Kg/mol, K, = 0.5 ‏کا‎ Kg/mol:
(A) 273K (B) 373K

(© 272.64K (D) 276.24 K

Assuming ideal behaviour, calculate the mass of a non-volatile liquid, whose molecular
mass = 120, which would be dissolved in 200 g of octane, by 2% lowering of vapour pressure :

(A) 4.12 gm (B) 4.21 gm
( 2.41gm (0) 2.14gm

‎of a salt, with general formula MX, , in water is 4 x 10-2. Calculate the concentration of‏ مكل
‎M** ions in the saturated aqueous solution of the salt :‏

‎(^) 4 > 10-12 mol/L (B) 1 > 10-2 mol/L

‎(C) 4x 10-4 mol/L (D) 1൧10൩017,

‎Which of the following change the value of K?
(A) adding reactant (B) adding product
(C) changing temperature (D) adding catalyst

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